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Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | $ 106.8 | $ 94.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.4 | 0.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.8 | 2.0
Debt Securities, Available-for-sale, Restricted | [1] | 106.4 | 93.2
Corporate bonds [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 49.4 | 40.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.2 | 0.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.4 | 0.9
Debt Securities, Available-for-sale, Restricted |  | 49.2 | 39.9
US Government and agency securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 35.6 | 35.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.4 | 0.9
Debt Securities, Available-for-sale, Restricted |  | 35.3 | 34.5
Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 20.1 | 18.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.2
Debt Securities, Available-for-sale, Restricted |  | 20.2 | 17.9
Municipal securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  |  | 0.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Debt Securities, Available-for-sale, Restricted |  |  | 0.7
Mortgage-backed securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 1.7 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Debt Securities, Available-for-sale, Restricted |  | $ 1.7 | $ 0.2
[1] | Measured at fair value on a recurring basis.

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